Well since you mention euphoria, I'm assuming that you use Ambien recreationally? It is insanely unique in high dosages thats's unlike anything that exists..In my much tounger years, I would take dosages in the triple digits. I was prescribed the 12.5mg CR formula becuase that was the most effective for putting me to sleep and KEEPING me asleep.. My previous issues with the Insant Release is that I would fall asleep, wake up in 2-3 hours, and then could never get past another latent period to reach more sleep...I took 12.5mg CR daily for almost 2 years and it lost its effect for potentiating rest after a month...I quit cold turkey, went through some terrible rebound insomnia and have been Ambien clear for over a year.... I'll never forget the high dose trips and their complete entrance into a new existence.. Oddest drug ever... Has dissociative qualities to me.